[Bug 89317] New: [HSW, regression, bisected] i965: Add LINTERP/CINTERP to can_do_cmod() (d91390634)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89317

            Bug ID: 89317
           Summary: [HSW, regression, bisected] i965: Add LINTERP/CINTERP
                    to can_do_cmod() (d91390634)
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: itoral at igalia.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

Steps to reproduce:

$ cd <deqp-home>
$ cd modules/gles3
$ ./deqp-gles3 -n
dEQP-GLES3.functional.shaders.builtin_functions.precision.sign.lowp_fragment.vec2

(...)
Test run totals:
  Passed:        0/1 (0.0%)
  Failed:        1/1 (100.0%)
  Not supported: 0/1 (0.0%)
  Warnings:      0/1 (0.0%)

The complete list of affected dEQP tests is:

dEQP-GLES3.functional.shaders.builtin_functions.precision.sign.lowp_fragment.vec2
dEQP-GLES3.functional.shaders.builtin_functions.precision.sign.lowp_fragment.vec3
dEQP-GLES3.functional.shaders.builtin_functions.precision.sign.mediump_fragment.vec2
dEQP-GLES3.functional.shaders.builtin_functions.precision.sign.mediump_fragment.vec3

The commit that introduced the regression is:

commit d91390634ff8c50b217d55372db186d03996e9f7
Author: Matt Turner <mattst88 at gmail.com>
Date:   Fri Jan 23 21:58:51 2015 -0800

    i965: Add LINTERP/CINTERP to can_do_cmod().

    LINTERP is implemented as a PLN instruction or a LINE+MAC. PLN and MAC
    can do conditional mod. CINTERP is just a MOV.

    total instructions in shared programs: 5952103 -> 5950284 (-0.03%)
    instructions in affected programs:     324573 -> 322754 (-0.56%)
    helped:                                1819

    We lose the SIMD16 in one Unigine Heaven shader which appears six times
    in shader-db.

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